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FrroutingApplication

CVE-2026-37457

HIGH · 7.5 CVSS v3.1 Published 2026-05-01
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An off-by-one out-of-bounds write vulnerability in the bgp_flowspec_op_decode() function (bgpd/bgp_flowspec_util.c) of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted FlowSpec component.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-787

The program writes past the bounds of a buffer, overwriting adjacent memory an attacker can turn to their advantage. Crafted input can overwrite control data and redirect execution. Remediation is validating every index and length before a write, plus modern memory-safety mitigations.

General guidance for the out-of-bounds write class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FrroutingApplication
Affected:= 10.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

FRRouting 10.0.1 or later stable release (verify exact version in release notes)

  1. 1. Identify the current FRRouting version installed using 'frr -v' or 'apt list --installed | grep frr'
  2. 2. Check if a newer FRRouting package is available in your distribution's repositories using 'apt update && apt search frr' or 'yum check-update frr'
  3. 3. If a newer version (e.g., 10.0.1 or later) is available, upgrade using 'apt-get install frr' or 'yum update frr'
  4. 4. If no newer package is available, apply the vendor patch from commit 0e6882bc72c0278988a47b2f0f73b7a91099a25c by rebuilding FRR from source
  5. 5. After upgrade or patch application, restart the FRR services using 'systemctl restart frr' or 'service frr restart'
  6. 6. Verify the bgp daemon is running: 'systemctl status bgpd' or check 'ps aux | grep bgpd'
  7. 7. Test BGP FlowSpec functionality with legitimate traffic to confirm normal operation
Caveat Minor: Review release notes for any configuration or behavioral changes between 10.0 and the target version

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-37457 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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